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69 lines
2.2 KiB
69 lines
2.2 KiB
use core::slice;
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use memory::{active_table, FRAME_ALLOCATOR, init_heap, MemoryArea, MemoryAttr, MemorySet, Stack};
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use super::riscv::addr::*;
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use ucore_memory::PAGE_SIZE;
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pub fn init() {
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#[repr(align(4096))]
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struct PageData([u8; PAGE_SIZE]);
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static PAGE_TABLE_ROOT: PageData = PageData([0; PAGE_SIZE]);
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let frame = Frame::of_addr(PhysAddr::new(&PAGE_TABLE_ROOT as *const _ as u32));
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super::paging::setup_page_table(frame);
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init_frame_allocator();
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let ms = remap_the_kernel();
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init_heap();
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use core::mem::forget;
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forget(ms);
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}
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fn init_frame_allocator() {
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use bit_allocator::BitAlloc;
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use core::ops::Range;
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use consts::{MEMORY_OFFSET, MEMORY_END};
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let mut ba = FRAME_ALLOCATOR.lock();
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ba.insert(to_range(end as usize, MEMORY_END));
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info!("FrameAllocator init end");
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fn to_range(start: usize, end: usize) -> Range<usize> {
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let page_start = (start - MEMORY_OFFSET) / PAGE_SIZE;
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let page_end = (end - MEMORY_OFFSET - 1) / PAGE_SIZE + 1;
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page_start..page_end
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}
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}
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fn remap_the_kernel() -> MemorySet {
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use consts::{KERNEL_HEAP_OFFSET, KERNEL_HEAP_SIZE};
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let kstack = Stack {
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top: bootstacktop as usize,
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bottom: bootstack as usize + PAGE_SIZE,
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};
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static mut SPACE: [u8; 0x1000] = [0; 0x1000];
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let mut ms = unsafe { MemorySet::new_from_raw_space(&mut SPACE, kstack) };
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ms.push(MemoryArea::new_identity(stext as usize, etext as usize, MemoryAttr::default().execute().readonly(), "text"));
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ms.push(MemoryArea::new_identity(sdata as usize, edata as usize, MemoryAttr::default(), "data"));
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ms.push(MemoryArea::new_identity(srodata as usize, erodata as usize, MemoryAttr::default().readonly(), "rodata"));
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ms.push(MemoryArea::new_identity(sbss as usize, ebss as usize, MemoryAttr::default(), "bss"));
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ms.push(MemoryArea::new(KERNEL_HEAP_OFFSET, KERNEL_HEAP_OFFSET + KERNEL_HEAP_SIZE, MemoryAttr::default(), "kernel_heap"));
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unsafe { ms.activate(); }
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info!("kernel remap end");
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ms
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}
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// Symbols provided by linker script
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extern {
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fn stext();
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fn etext();
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fn sdata();
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fn edata();
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fn srodata();
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fn erodata();
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fn sbss();
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fn ebss();
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fn start();
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fn end();
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fn bootstack();
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fn bootstacktop();
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} |